Bankers Trust Co. is asking the city of Des Moines Zoning Board of Adjustment to allow four signs on the roof of the Ruan Center, 666 Grand Ave. The Bankers Trust signs each require size or placement variances. In all, Bankers Trust is proposing a total of 1,313 square feet of signage that would face north, south, east and west. The board is scheduled to take up Bankers Trust's request at its Feb. 26 meeting.